2Forty Posted May 28, 2003 Share Posted May 28, 2003 I just picked up a "383 stroker" motor out of a 89 Chevy pickup 4x4. It sounded good after it was started, no unusual noises. It has EFI on it. How do I verify it's a 383? It's supposedly a crate engine. Quote Link to comment Share on other sites More sharing options...
David K Posted May 28, 2003 Share Posted May 28, 2003 I think a 383 stroker has a crank out of a 4?? block and its also overbored with larger pistons. I was going to do that with my IROC. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted May 28, 2003 Share Posted May 28, 2003 You can't unless you want to pull the crank out. Or you can pull the pan off. If it as the pan rails notched to clear the rods its a 383. Quote Link to comment Share on other sites More sharing options...
80LS1T Posted May 28, 2003 Share Posted May 28, 2003 If its a crate motor is it possible that there might be someting on the block? Like a casting number? Or do they just do like everyone else and use a 350 block, bore .030" over and use a 400 crank? Guy Quote Link to comment Share on other sites More sharing options...
dmyntti Posted May 28, 2003 Share Posted May 28, 2003 One way you could tell depending on the type of crank used is: Look for a 400 style balancer and flywheel. The 400 crank requires external balancing where the 350 was internally balanced. Most 383 will have the externally balanced crank but there are some 383 crank that are internally balanced so if you have the 350 style balancer and flywheel there is still a chance it is a 383. If you don't mind taking it apart you could measure the piston stroke and compare it to a 400. Just a few thoughts, someone else may have a better idea though. Quote Link to comment Share on other sites More sharing options...
Guest JAMIE T Posted May 28, 2003 Share Posted May 28, 2003 Actually, the easiest way is to look at the damper and flex plat to see if it is EXTERNALLY balanced. There will be counter weights on them if it is a 3.75" stroke. If it has a stock 350 stroke, then It will be internally balanced, and not have any obvious counter weights. It's possible some one would have had the 3.75" crank internally balanced, BUT DON'T COUNT ON IT! Just ask a few guys(like MIkelly) how much of a PITA it is to get one internally balanced without spending big bucks on a forged crank. Quote Link to comment Share on other sites More sharing options...
80LS1T Posted May 28, 2003 Share Posted May 28, 2003 Dont they make actual 383 Cranks too? Like ones specifically designed just for doing the stroker on a 350? What about those...are they internally or externally balanced? Guy Quote Link to comment Share on other sites More sharing options...
Pop N Wood Posted May 28, 2003 Share Posted May 28, 2003 Fill the cylinder with Marvel Mystery oil and measure the displacement. Quote Link to comment Share on other sites More sharing options...
Guest Thurem Posted May 28, 2003 Share Posted May 28, 2003 Guess you gotta find a way to fairly accurately measure the stroke. Prolly have to go thru the sparkplug hole. Coathanger city here we come. remember the stroke on a 350 is 3.48" on a 383 it's 3.75" . I say go for it, just make sure you don't leave any debris in the cylinder. Thure Quote Link to comment Share on other sites More sharing options...
2Forty Posted May 28, 2003 Author Share Posted May 28, 2003 I checked the flywheel and it has a counter-weight on one side. I guess that's good. The flywheel has 168 teeth, I guess that's bad according to JTR. It has center-bolt valve covers, an aluminum intake, and a serpentine belt with alt, pwr strng, A/C still attached. Anyone know who I can call to have the casting number checked? Thanks Quote Link to comment Share on other sites More sharing options...
Datsun660z Posted May 28, 2003 Share Posted May 28, 2003 The flywheel has 168 teeth, I guess that's bad according to JTR That is not really bad it only limits what starters you can use. I have 168 tooth flexplates on both of my Zs with SBC 406's. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted May 29, 2003 Share Posted May 29, 2003 If it has a weight on the flywheel then it is a 383. It wouldn't hurt to put a new rear main seal and a new front transmission seal in before you put it in the car. Quote Link to comment Share on other sites More sharing options...
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